To evaluate the diagram shown in Fig. REF (a), the following effective Lagrangians are needed [1]}, [2]}, [3]}, [4]}\(^{[2]}\) 
[2]Notice that in our work, the Lagrangian in Eq. REF  is different from Re. [1]} where the constants are collected in \(g_{\gamma {}V\eta _1}\) .
\({\cal {L}}_{\gamma {}V\eta _1}&=g_{\gamma {}V\eta _1}{\cal {F}}_{\mu \nu }V^{\mu }\eta _1^{\nu },\\{\cal {L}}_{VNN}&=-g_{VNN}\bar{N}[\gamma _{\mu }-\frac{\kappa _V}{2m_N}\sigma _{\mu \nu }\partial ^{\nu }]V^{\mu }N,\) 
